Device and method for applying a product on a fingernail, assembly for storing and application of such a product

ABSTRACT

A device for applying a product on a fingernail includes an applicator end-piece able to be loaded with product and to apply the product on the fingernail. The end-piece includes a notch formed between two facing application surfaces intended for the application of the product on two faces of the fingernail.

CROSS-REFERENCE TO RELATED APPLICATIONS

This document claims priority to French Application Number 06 06564, filed Jul. 19, 2006 and U.S. Provisional Application No. 60/836,970, filed Aug. 11, 2006, the entire content of which are hereby incorporated by reference.

FIELD OF THE INVENTION

One or more examples of the invention relate to the treatment of fingernails and more particularly the application of a product for the makeup or treatment of fingernails. An example of the invention relates to the makeup known as “French manicure” can include steps of depositing a white product at the end of varnished fingernails to imitate the white tips of fingernails.

BACKGROUND OF THE INVENTION Discussion of Background

Conventionally, the application of a product on the fingernails is carried out using a brush mounted on a rod carried by a grasping device which is manipulated in such a way as to plunge the brush into a container filled with the product to be applied and to put it in contact with the outside surface of the fingernail in order to deposit there a layer of the product.

In certain cases, for example in the context of using “French manicure” makeup, it is possible to use a mask in order to leave apparent only the white ends of the fingernails or to use a special applicator shaped in order to apply a product accurately on these fingernail ends.

In this respect, related art document FR 2 836 029 describes a product applicator which comprises an end-piece shaped so as to allow the application of a product on the end of a fingernail and to do so in a uniform and accurate manner.

However, the end of a fingernail is the most fragile and it is in fact often likely to break, crack, split or become yellow. Consequently, the ends of fingernails need to be particularly cared for and maintained.

In order to be effective, a care treatment, which includes applying a treatment product on the end of a fingernail, can provide for the application of a treatment product on both faces of the fingernail. That is, product is applied on both the outside surface or convex surface of the fingernail, and on the inside surface or concave surface of the fingernail.

As discussed in FR 2 427 806, a care device for fingernails is known, which comprises a reservoir containing a foam intended to be soaked with a treatment or care liquid. When a finger is inserted in the foam, a certain quantity of liquid is regurgitated and comes into contact with the two surfaces, inside and outside, of the fingernail. However, the device provided is adapted only for treating a fingernail with a product present in the form of a liquid. Moreover, it is not suitable for applying a product on a localized surface.

SUMMARY OF THE INVENTION

In the light of the above, there is a need for a product applicator for fingernails capable of applying, easily and effectively, all types of fluid or viscous products on both faces of a fingernail.

One or more examples of the invention provide an applicator which is capable of applying a product on both faces of a fingernail, namely the outside convex face and the inside concave face of a fingernail, and to do so simultaneously.

According to a first example of the invention, a device for applying a product on a fingernail is provided that includes an applicator end-piece able to be loaded with product and able to apply the product on the fingernail.

A device according to one or more examples of the invention includes an end-piece having a notch delimiting two facing application surfaces intended for the application of the product on both faces of the fingernail. According to this feature, it is possible, due to the presence of the two application surfaces, to carry out a simultaneous application of a product on the outside face and on the inside face of the fingernail. Furthermore, such an end-piece is particularly suitable for applying a product on a localized surface.

According to an example, at least one of the application surfaces is incurved or has a non-planar shape. For example, one of the application surfaces which is intended for the application of the product on the top of the fingernail has a concave shape, with its concavity facing the notch. This concave face is thus particularly suitable for applying the product on the outside surface of the fingernail.

According to a further example, the other application surface is convex, with its convexity facing the notch. This surface is therefore particularly suitable for carrying out the treatment of the inside surface of the fingernail.

In one or more embodiments of the invention, due to the presence of the notch, the end-piece includes two tongues which extend on either side of the notch, each tongue forming one of the surfaces.

According to an example, the length of each tongue is between about 3 and about 10 mm. One of the tongues, which is intended for applying the product on the top of the fingernail, can have for example, an increased length with respect to the other. The length of this tongue can be for example, equal to that of the fingernail.

Thus, when the treatment of the inside face of the fingernail is carried out, it is possible to proceed simultaneously with the application of the product on the whole of the upper surface of the fingernail.

According to an example, a difference in length between the tongues is between 0 and 7 mm. According to a preferred example, the distance between the free ends of the tongues can be between 1 and 6 mm.

Moreover, an example of the invention provides for the tongues to be formed with an angle between them of less than 180°. A further preferred example forms the angle between the tongues at less than about 50°.

An embodiment of the invention provides the applicator end-piece with a width which can correspond substantially with that of the free edge of the fingernail.

According to another example of the invention, the edge of the tongue, which is intended for the application of the product on the outside face of the fingernail, has a concave shape complementary to that of the free edge of the fingernail, in particular when it is appropriate to apply a product in a localized manner on the white end of the fingernail.

According to a further example, this free edge of the tongue can also have a convex shape complementary to that of the base of the fingernail.

According to a preferred example, the tongue will be conformed in such a way that its free edge adopts a convex shape when the tongue has an increased length.

With regard to the other tongue, which is intended for the application of the product on the inside face of the fingernail, an example provides for its end edge to preferably have a concave shape.

In one embodiment, the end-piece comprises two parallel longitudinal sides which extend from the free end edge. In a further example, the end-piece can include two converging longitudinal sides which extend from the free end edge. As such, one or more examples of the invention can have parallel or non-parallel sides.

According to yet another feature of the invention, the device further includes a rod and a grasping member, the rod including a first end integral with the grasping member and an opposite end on which the end-piece is fitted. For example, the grasping member can be a closing cap of a product storing receptacle.

In one embodiment, the end-piece is at least partly made from elastically deformable material. For example, the application surface intended for the application of the product on the bottom of the fingernail comprises a material more rigid than the application surface intended for the application of the product on the top of the fingernail.

An example of the invention provides for at least a part of the end-piece to include an elastomer. An even further example provides for at least a part of the end-piece to include a silicone.

According to yet another embodiment of the invention, at least one of the application surfaces is abrasive.

In use, for example, the notch provides a stop against which the end edge of the fingernail will come to bear. It is thus possible to produce the notch with a concave shape.

According to another aspect, an embodiment of the invention also relates to an assembly for storing a product and for application of the product on a fingernail that includes a reservoir for storing the product and an application device having an end-piece for applying the product on the fingernail, such that the end-piece includes a notch delimiting two facing application surfaces intended for the application of the product on two faces of the fingernail.

According to a further aspect, an embodiment of the invention also relates to a method for applying a product on a fingernail with a device having an applicator end-piece able to be loaded with product and able to apply the product on the fingernail.

According to a general feature of this embodiment, the end-piece has a notch delimiting two facing application surfaces intended for the application of the product on two faces of the fingernail. The method can include the following steps: loading the two application surfaces with product; and putting the application surfaces in contact with the outside face and with the inside face of the fingernail in order to apply the product on both faces simultaneously.

In one implementation of the exemplary method, the application surfaces are moved transversely with respect to a principal axis of the fingernail.

As should be apparent, the invention can provide a number of advantageous features and benefits. It is to be understood that, in practicing the invention, an embodiment can be constructed to include one or more features or benefits of embodiments, disclosed herein, but not others. Accordingly, it is to be understood that the preferred embodiments discussed herein are provided as examples and are not to be construed as limiting, particularly since embodiments can be formed to practice the invention that do not include each of the features of the disclosed examples.

BRIEF DESCRIPTION OF THE DRAWINGS

A better understanding of the invention will be gained from reading the following description in conjunction with the accompanying figures. The figures are offered purely as a guide and by way of example, and in no way limit the invention.

FIG. 1 is a perspective view of an example of the invention;

FIG. 2 is a back of an example of the invention;

FIG. 3 is a front view of an example of the invention;

FIG. 4 is a perspective view of another example of the invention provided with an applicator end-piece of different shape;

FIG. 5 is a back view of another example of the invention provided with an applicator end-piece of different shape;

FIG. 6 is a perspective view of an applicator end-piece of a device of an example of the invention;

FIG. 7 is a back view of an applicator end-piece of an example of the invention;

FIG. 8 is a back view of an applicator end-piece of another example of the invention;

FIG. 9 is a back view of an applicator end-piece of a further example of the invention;

FIG. 10 is a side profile view of an applicator end-piece of an example of the invention;

FIG. 11 is a side profile view of an applicator end-piece of an example of the invention;

FIG. 12 is an applicator end-piece of a device according to a further example of the invention;

FIG. 13 shows an applicator end-piece of a device according to an example of the invention;

FIG. 14 shows an applicator end-piece of a device according to a further example of the invention;

FIG. 15 shows an applicator end-piece of a device according to an example of the invention; and

FIG. 16 shows yet another device according to an example of the invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Referring now to the drawings, like reference numerals are utilized to designate identical or corresponding parts throughout the several views.

FIGS. 1, 2 and 3 show a product application device according an example of the invention, indicated by the general numerical reference 1.

As will be described in detail below, this device 1 is intended for the application of a product on a fingernail and, in particular, on the inside and outside faces of the fingernail.

More particularly, in one exemplary application, this device 1 is intended for simultaneously applying a product on the inside and outside faces of the white tip of the fingernail. Thus, the product applied is for example a treatment or care product able to make this part of the fingernail less fragile, less breakable and less subject to yellowing or splitting, that is to say, in general, stronger.

As seen in FIG. 1, the device 1 according to this example can include an end-piece 2 provided with a proximal end 3 mounted on a rod T. A bifid or forked distal end 4 is provided with two tongues 5 and 6 each delimiting an application surface, 7 and 8 respectively.

The end-piece 2 thus includes a first application surface 7 intended for the application of a product on the outside face of the fingernail and a second application surface 8, intended for applying the product on the inside face of the fingernail.

In the example embodiment shown, the rod T preferably carries at one of its ends the applicator end-piece 2 and is fitted by its other end to a grasping member 9.

Preferably, this grasping member 9 constitutes a cap which is intended to close an open end forming the neck of a receptacle for storing the product to be applied. The grasping member 9 therefore has, for example, a globally cylindrical or frustroconical shape and can be provided internally with a screw thread intended to cooperate with an external screw thread of the neck of the receptacle. It should be appreciated that the grasping member 9 can be any size or shape and can be formed with any desirable securing device that will allow the grasping member 9 to be connected to the neck of the receptacle.

As seen in FIG. 1, the tongues 5 and 6 can be formed by providing, in the end piece, a transverse notch 10, with respect to a general geometrical axis of the rod T. Thus, according to this example of the invention, the end-piece 2 is not conformed by appropriately cutting a tuft of hairs or fibres, but by providing a transverse notch. Thus, the bifid end-piece 2 can be made of one or more of any desirable types of material, excluding a set of hairs or fibres cut appropriately in a V-shape.

According to an example of the invention, the notch 10 can have a transverse cross-section, that is to say a cross-section through a plane parallel with the axis of the rod T, in the shape of a V whose branches form the two application surfaces 7 and 8 of the end-piece 2. In other words, starting from the proximal end 3, the end-piece 2 includes a first portion 11 widening from the proximal end, an intermediate portion 12 for example of parallelepipedic shape, then a distal portion 13 in which are formed the two tongues 5 and 6 by providing the transverse notch 10.

It should be appreciated that the notch 10 and, in general, the end-piece 2 can be configured according to any desirable shape and dimensions of the application surfaces 7 and 8 to be obtained. Thus, the distal end 4, that is to say the free edge of the tongues 5 and 6, will be conformed according to the shape of the application surfaces that are desired to be obtained. In the example shown in FIGS. 1, 2 and 3, the free edge of each of the tongues has a concave shape.

In a preferred example, each application surface 7 or 8 can be produced by curving the surface about an axis parallel with the general axis of the rod T. However, it is also possible to curve the application surface about another axis, for example about a transverse axis in such a way as to match the morphology of the fingernail. Accordingly, the curvature of the application surfaces can be obtained by appropriately shaping the end-piece or by providing a flocking with fibres having different lengths.

According to an example with regard to the first application surface, this surface preferably adopts a concave surface in order to match the convex surface of the outside face of the fingernail. The other application surface can have a convex shape in order to correspond to the inside face of the fingernail. As such, the first tongue 7 is particularly suitable for applying a product on the outside surface of the fingernail, whilst the other tongue 8 is suitable for the application of a product on the inside surface of the fingernail.

Whereas, in the example shown in FIGS. 1, 2 and 3, the free edge of the first tongue 5 adopts a slightly concave or straight shape, it is also possible, as shown in FIGS. 4 and 5, to configure this end in a convex shape in order to match the shape of the base of the fingernail.

With regard to the other tongue 6, a concave shape able to match the shape of the pad of the finger will preferably be retained. This shape is particularly advantageous when the first tongue adopts an increased length in order to allow the treatment of the whole of the upper surface of the fingernail.

Similarly, whereas in the examples shown in FIGS. 1-5, the width L of the applicator end-piece can be such that it corresponds globally to that of the fingernail, and in particular to the free edge of the fingernail. It should be appreciated that such an end-piece can adopt a smaller width L′ such that the narrow shape of the end-piece 2 necessitates, during the application, provision of a transverse movement of the application surfaces with respect to the surfaces of the fingernail (FIG. 6). Such a movement is advantageous when, as will be described below according to a further example, the inside application surface 8 is made from a rigid and relatively abrasive material in order to procure a cleaning function for the second tongue 6. Such a narrow shape can of course be envisaged equally well when the free edge of the first tongue 5 is concave, as shown in FIGS. 1, 2 and 3, or convex, as shown in FIGS. 4 and 5.

With regard to the general shape of the end-piece 2, the median part 12 for example adopts, as shown in FIGS. 1 to 6, a globally parallelepipedic shape whose longitudinal edges, which prolong the lateral ends of the tongues, extend straight and parallel with each other. However, the scope of one or more examples of the invention does not depart from having the edges slightly curved.

Similarly, the scope of one or more examples of the invention do not depart from having the longitudinal edges of the end-piece convergent towards the proximal end 3, as shown in FIGS. 7, 8 and 9. In this example, the end-piece 2 has a globally triangular shape. As shown in FIG. 8, it is also possible to provide longitudinal edges convergent towards the distal end of the end-piece. In this way, an application using a transverse movement with respect to the principal axis of the fingernail will be favoured.

According to one or more examples of the invention, such a triangular shape can of course be adopted in order to produce relatively wide end-pieces, according to the disclosure of FIGS. 1 to 5, or to produce a relatively narrow end-piece according to the disclosure of FIG. 6, this end-piece being able to be provided with tongues having an end edge that is indifferently concave or convex.

Furthermore, it will also be noted that the scope of one or more examples of the invention does not depart from when, as mentioned previously, one of the tongues, namely the tongue denoted by the numerical reference 5, which is intended to apply a product on the outside face of the fingernail, has an increased length (FIGS. 10 and 11). For example, a length such that the end-piece makes it possible to apply the product simultaneously on the inside face of the white tip of the fingernail and over the whole of the outside surface of the fingernail. In this example, preferably, as mentioned before with reference to FIG. 4, the free edge of the first tongue 5 can be configured such that it adopts a convex shape complementary to the concave shape of the base of the fingernail.

In one or more of the various embodiments, the tongues can be formed by providing a transverse notch at the free end of the applicator end-piece, the application surfaces 7 and 8 extending transversely with respect to the general axis of the rod T whilst being slightly inclined, due to the V shape of the notch. However, according to the general disclosure of one or more examples of the invention, it is also possible to produce the various embodiments using a notch with a square or rectangular transverse cross-section, the two application surfaces can then extend globally parallel with each other.

Further, one or more of the various embodiments can provide the application surfaces 7 and 8 longitudinally, that is to say along one or both longitudinal edges of the end-piece.

The advantageous embodiments shown in the drawings makes it possible to combine the advantages associated with the use of an end-piece of increased width and a first tongue of increased length in order to apply product on the outside surface of the fingernail.

According to a further example, when it is desired to apply a product only on the free edge of the fingernail O, as shown in FIGS. 12 and 13, the two tongues 5 and 6 will be produced such that each of their lengths corresponds to the surface to be treated. Such an embodiment is particularly suitable for producing a makeup of the fingernails of the “French manicure” type. In this example, the free edge of each tongue can preferably be concave.

On the contrary, according to a further example, when it is desired to treat simultaneously the inside surface of the free edge of the fingernail and the whole of the outside surface, referring to FIGS. 14 and 15, the first tongue 5 can have an increased length, which corresponds to that of the surface of the fingernail. In this example, preferably, the free end of the first tongue is convex in order to be able to treat the whole of the surface of the fingernail.

In one or more embodiments of the invention, the tongues are formed by a V-shaped notch or with a square or rectangular cross-section. Advantageously, the bottom of the notch, that is to say the junction line or surface extending between the tongues, provides a stop against which the end of the fingernail to be made up comes to bear. This junction line or surface can therefore be straight but the end-piece can preferably be produced such that the junction line or surface is curved or concave with its concavity facing the outside of the end-piece, that is to say towards the fingernail to be made up.

In an example, when the tongues are delimited by a V-shaped notch, the inclined application surfaces form between them a non-zero angle. As shown in the example of FIGS. 13 and 15, this angle can be less than about 180°. A further example of the invention forms the end-piece 2 such that the angle α is an acute angle, for example less than about 50°. A further preferred example forms the angle at less than about 10°. When at least one of the application surfaces is curved, this angle is measured taking into consideration the tangent to that surface or the tangents to the application surfaces if these are both curved. The above angular values can be measured from the junction line or surface of the two application surfaces. It is within the spirit and scope of one or more examples of the invention to provide the angle at any desirable angle.

As best shown in FIGS. 13 and 15, the tongues advantageously can have a pointed shape. In particular, as seen in these figures, the angles β1 and β2 formed respectively by the tongues 5 and 6 and each delimited by an application surface and by an outside surface 51 or 61 of these tongues, are not zero. According to an example, these angles are acute, for example, advantageously less than about 50°. A preferred example provides these angles between about 5 and about 30°. When the angles β1 and β2 are different from each other, one of the angles, namely β1 formed by the tongue intended to be applied against the inside face of the fingernail can have, preferably, a value of between about 5 and about 30°. The other angle β2 formed by the tongue intended for applying the product on the outside face of the fingernail, can preferably have a value of between about 10 and about 50°.

As discussed above with respect to one or more examples of the invention, the application surfaces 7 and 8 can be used to come at least substantially simultaneously into contact with the upper and lower faces of the fingernail. According to further examples, they can also be brought into contact alternately on the upper face and then on the lower face of the fingernail, if desired according to an alternating to-and-fro movement, as envisaged previously with reference to FIG. 6. In the case where it is desired to bring the application surfaces simultaneously into contact with the upper and lower faces of the fingernail, the distance 1 between the ends of the tongues must be as small as possible. For example, the distance can be between about 1 and about 6 mm.

Moreover, with regard to the length h or axial height of the tongues, considered between the junction line or surface of the application surfaces and the free end of each tongue, this length can be for example, between about 3 and about 10 mm. According to an example, the tongues can have identical or different lengths. In the example with the tongues of different lengths, the distance h between the free ends of each tongue can be between about 0 and about 5 mm. In a preferred example, the distance can be about 7 mm or more, depending on the manner in which it is wished for the longest tongue to cover the upper face of the fingernail. Preferably, for a makeup of the fingernails of the “French manicure” type, this value h can be for example, between about 2 and about 3 mm.

As shown in the example of FIG. 16, the rod T can be preferably integral with a grasping device 9 which constitutes a closing cap of a reservoir R for storing the product to be applied. Thus, in order to take and apply product on the fingernail, it is simply appropriate, starting from the position shown in FIG. 16, in which the reservoir R is closed by the cap 9, to extract the rod T and the applicator 2 which it carries and to apply the two application surfaces, one against the inside surface of the fingernail and the other against the outside surface, in order to apply the treatment product.

In order to prevent the end-pieces 2 from being overloaded with product, it is possible to provide the neck of the reservoir R with a wiping device, for example made in the form of a ring.

The end-piece 2 can be made from various materials depending on the effects to be obtained. Thus, in order to obtain a cleaning function, the second tongue can be made, for example, in a rigid form. It is further possible, in a complementary manner or in isolation, to produce the application surface of the second tongue from a slightly abrasive material in order to carry out this cleaning function or to increase it. It will also be possible, as a variant, to produce the end-piece from a flexible, elastically deformable material, in order to confer great flexibility making it possible to match the curvature of the fingernail as well as possible with regard to both the outside surface and the inside surface. However, it will also be possible to produce the end-piece in such a way as to provide a relatively rigid tongue for the bottom of the fingernail, possibly abrasive, and a more flexible tongue for the top of the fingernail in order, for example, to provide this tongue with a polishing function.

In the various envisaged embodiments, the end-piece can be made from an elastomer, silicone-coated, or from all types of materials appropriate for the envisaged use with the exclusion of a tuft of trimmed hairs fibres. It is also possible to provide the application surfaces in the form of smooth surfaces or a flocking on the end-piece in order to further increase the gentleness of the application or again to use a slightly more abrasive sintered end-piece which will act, in use, like a file or a polisher at the time of application.

Obviously, numerous modifications and variations of the present invention are possible in light of the above teachings. It is therefore to be understood that within the scope of the appended claims, the invention may be practiced otherwise than as specifically described herein. 

1. A device for applying a product on a fingernail, comprising: an applicator end-piece configured to retain the product on a surface thereof and to apply the product on the fingernail, wherein the end-piece includes a notch formed between a first and second application surface, the first and second application surfaces are configured to face each other and apply the product to a first face and a second face of the fingernail.
 2. The device according to claim 1, wherein at least one of the application surfaces has a non-planar shape.
 3. The device according to claim 2, wherein one of the application surfaces has a concave shape and is configured to apply the product on a top of the fingernail, the concavity of the surface faces the notch.
 4. The device according to claim 3, wherein another of the application surfaces is convex, with its convexity facing the notch.
 5. The device according to claim 1, wherein two tongues that extend on either side of the notch form the first and second application surfaces.
 6. The device according to claim 5, wherein the length of each tongue is between about 3 and 10 mm.
 7. The device according to claim 5, wherein the tongue configured to apply the product on a top of the fingernail has a greater length than the other tongue.
 8. The device according to claim 7, wherein the difference in length between the two tongues is less than about 7 mm.
 9. The device according to claim 5, wherein the distance between each of an end portion of each tongue distant from the notch, is between about 1 and 6 mm.
 10. The device according to claim 5, wherein the tongues form an angle between them of less than 180°.
 11. The device according to claim 7, wherein the length of the tongue used to apply the product to the top of the fingernail corresponds substantially to a length of the fingernail.
 12. The device according to claim 5, wherein a width of the tongues corresponds substantially to a width of an edge of the fingernail.
 13. The device according to claim 5, wherein an edge of the tongue that is configured to apply the product on an outside face of the fingernail has a concave shape complementary to that of an edge of the fingernail.
 14. The device according to claim 5, wherein an edge of the tongue that is configured to apply the product on the outside face of the fingernail has a convex shape complementary to that of the base of the fingernail.
 15. The device according to claim 5, wherein an edge of the tongue configured to apply the product on an inside face of the fingernail has a concave shape.
 16. The device according to claim 1, wherein the applicator end piece includes two substantially parallel longitudinal sides.
 17. The device according to claim 1, wherein the applicator end piece includes two non-parallel longitudinal sides.
 18. The device according to claim 1, further comprising: a rod having a first end; and a grasping member, wherein the first end of the rod is integral with the grasping member and an opposite second end of the rod is fitted with the applicator end-piece.
 19. The device according to claim 18, further comprising: a storing receptacle configured to store the product and connectable with the applicator end-piece, wherein the grasping member is a closing cap to secure the product in the storing receptacle.
 20. The device according to claim 1, wherein at least part of the applicator end-piece is formed of an elastically deformable material.
 21. The device according to claim 1, wherein an application surface intended for the application of the product on a bottom of the fingernail is formed from a material more rigid than that of an application surface intended for the application of the product on the top of the fingernail.
 22. The device according to claim 1, wherein at least a part of the end-piece is formed of elastomer.
 23. The device according to claim 1, wherein at least part of the end-piece is formed from silicone.
 24. The device according to claim 1, wherein at least one of the application surfaces is abrasive.
 25. The device according to claim 1, wherein the notch forms a stop against which the end edge of the fingernail will contact.
 26. The device according to claim 25, wherein the notch is concave.
 27. The device according to claim 5, wherein the tongues form an angle between them of less than 50°.
 28. An assembly for storing a product and for application of the said product on a fingernail, comprising: a reservoir configured to store the product; and a device including an end-piece for applying the product, wherein the end-piece includes two application surfaces with a notch formed there between, and wherein the two application surfaces are configured to apply product to two different surfaces of the fingernail.
 29. The assembly according to claim 28, wherein a first application surface has a concave shape and is configured to apply the product on a top of the fingernail, and a second of the application surfaces is convex and configured to apply the product to a bottom surface of the fingernail.
 30. The assembly according to claim 29, wherein the first application surface has a greater length than the second application surface.
 31. The assembly according to claim 30, wherein the length of each application surface is between about 3 and 10 mm.
 32. The assembly according to claim 28, wherein the first and second application surfaces form an angle between them of less than 50°.
 33. The assembly according to claim 28, further comprising: a rod having a first end and a second end; and a grasping member, wherein the first end of the rod is integral with the grasping member and the applicator end-piece is secured to the second end of the rod.
 34. The assembly according to claim 33, wherein the grasping member is a closing cap connectable to the reservoir and configured to secure the product in the reservoir.
 35. The assembly according to claim 29, wherein the second an application surface is formed from a material more rigid than material of the first application surface.
 36. The assembly according to claim 29, wherein at least one of the application surfaces is abrasive.
 37. A method for applying a product on a fingernail using a device having an applicator end-piece able to be loaded with product and able to apply the product on the fingernail, the end-piece including a notch delimiting two facing application surfaces intended for the application of the product on two faces of the fingernail, the method comprising: loading the two application surfaces with product; and placing the application surfaces in contact with an outside face and with an inside face of the fingernail in order to apply the product on both faces simultaneously.
 38. The method according to claim 37, wherein the application surfaces are moved substantially transversely with respect to a principal axis of the fingernail.
 39. The method according to claim 37, wherein at least one of the application surfaces has a non-planar shape.
 40. The method according to claim 37, further comprising: applying the product on a top surface of the fingernail with one of the application surfaces having a concave shape; and applying the product to a bottom surface of the fingernail with the other application surface having a convex shape.
 41. The method according to claim 40, wherein the application surface configured to apply the product on a top of the fingernail has a greater length than the other application surface.
 42. The method according to claim 40, wherein the application surface configured to apply the product on a bottom of the fingernail is formed from a material more rigid than a material used to form the application surface configured to apply the product on the top of the fingernail. 